Method BuildBLASWithOMM

Rtxpt/OpacityMicroMap/OmmBuildQueue.cpp:383–394

}

void OmmBuildQueue::BuildBLASWithOMM(nvrhi::ICommandList& commandList, BuildTask& task, const std::vector<bvh::OmmAttachment>& ommAttachment)
{
    nvrhi::rt::AccelStructDesc blasDesc = bvh::GetMeshBlasDesc(task.input.bvhCfg , *task.input.mesh, ommAttachment.data(), false);
    // The spec says instance Id is only 24 bits, and we already take 16 for the instance index, so we only have 8 bits for the geometry.
    // On the other side, we could completely skip this and just use DXR 1.1's GeometryIndex() directly in the shader.
    assert((int)blasDesc.bottomLevelGeometries.size() < (1 << 8)); // we can only hold 8 bits for the geometry index in the HitInfo - see GeometryInstanceID in SceneTypes.hlsli
    nvrhi::rt::AccelStructHandle as = m_device->createAccelStruct(blasDesc);
    nvrhi::utils::BuildBottomLevelAccelStruct(&commandList, as, blasDesc);
        
    // Store results
    std::static_pointer_cast<MeshInfoEx>(task.input.mesh)->AccelStructOMM = as;
}

void OmmBuildQueue::RunBakeAndBuild(nvrhi::ICommandList& commandList, BuildTask& task)
{